Nikolay Konstantinov with colleagues after receiving his Paul Erdös Award at ICME-7, Quebec, in 1992.

From left Alexander Soifer (USA), Nikolay Konstantinov (Russia), Mark Saul (USA), Peter O'Halloran (Australia, WFNMC President), Ed Barbeau (Canada), Marcin Kuczma (Poland) and Kiril Bankov (Bulgaria).